Cleaning device for framemounted net filters

Claim 1

IN A FILTER CLEANING DEVICE COMPRISING A NET FILTER, A FRAME HAVING SUPPORT MEANS TO RECEIVE AT LEAST ONE NET FILTER THEREIN, A HOLLOW SUCTION HEAD MOUNTED ADJACENT SAID SUPPORT MEANS, SAID SUCTION HEAD HAVING AN EXTENDED SUCTION SLOT THEREIN FACING AND TRANSVERSE TO THE SUPPORT MEANS, SUCTION MEANS CONNECTED TO SAID SUCTION HEAD TO DRAW SUCTION THROUGH SAID SUCTION SLOT AND SAID FILTER, AND DRIVE MEANS CONNECTED TO SAID SUCTION HEAD TO RECIPROCATE SAID HEAD RELATIVE TO SAID FILTER-RECEIVING SUPPORT MEANS; THE IMPROVEMENT WHEREIN SAID SUCTION MEANS INCLUDES A SUCTION BOX COEXTENSIVE WITH SAID SUPPORT MEANS AND MOUNTED ADJACENT SAID SUCTION HEAD, SAID BOX HAVING A LONGITUDINALLY EXTENDING OPENING, A DISPLACEABLE SEALING STRIP SECURED TO SAID BOX AT ITS OPPOSITE ENDS AND COVERING SAID OPENING THROUGHOUT ITS LENGTH, SAID HEAD HAVING AN OFFSET PORTION DISPOSED INTERMEDIATE SAID OPENING AND SAID STRIP TO LOCALLY DISENGAGE SAID STRIP FROM SAID OPENING, A CONNECTING SLOT IN SAID OFFSET PORTION MATING WITH SAID OPENING TO AFFORD FREE COMMUNICATION BETWEEN SAID SUCTION BOX AND THE INTERIOR OF SAID HEAD, SAID PORTION SLIDING LONGITUDINALLY OF SAID OPENING UPON RECIPROCATION OF SAID HEAD, AND MEANS CARRIED BY SAID HEAD AT THE OPPOSITE ENDS OF SAID OFFSET PORTION OPERABLE TO PRESS SAID STRIP AGAINST SAID OPENING TO PREVENT LEAKAGE THROUGH SAID OPENING ADJACENT SAID PORTION.